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If nozzle is partially clogged, it can cause unloader valve to shift back and forth from high pressure to bypass. Air in the feed line can also cause this symptom. Some Karcher models have auto start/stop system which can behave this way if worn out, or out of adjustment.

sounds like you have an inlet blockage to the pump or not enough volume to feed the pump. make sure hose is turned full on when washing and see what happens. if not you may have to remove adapter wher hose screws in and check for a blockage.

yes...check the check valve. A one-way directional valve, this part is also known as a DUMP valve. It opens when too much pressure builds in the hand wand (when not spraying water) in order to protect the pump, by returning the high pressure to its source reservoir. I suspect the DUMP valve is stuck in open condition (or nearly open).